Stove, furnace, and the like.



H. ennnns. STOVE, PUB NAOB, AND TEE LIKE.

. APPLHMTMI FILED 233.86, 1900.

f mm Jun 8, 1909.

ml "will mm 29, Inmnolnn. b. I.

'HEINRIGH GERDES, OF BERLIN, GERMANY.

STOVE,- roarmoa, AND THE LIKE.

Specification of Letters Patent.

Patented June 8, 1909.

Application nledfiebruary 2c, 1909., Serial No. 480,201.

To all whom it may concern:

Be it known that I, .HnmnronGnanns, a-j

citizen of the German Empire, and residin at Berlin, German Em ire, 'baveinvente certain new and usefu Improvements in,

Stoves, Furnaces, andthe' Likaofwhich the following is a clear arid'exact-specifieation.v The present inventionfrelates to stoves or furnaces, and more particularly tothat; class of furnace generally employed; for-heating buildings and rooms, and which isconstrueted somewhat on the system of the tube boilers. In connection with this {classoffurnace there is o tendenc on the .part of the lower tube plate, which is usuallyjm'ountedon the. fire-brickwork lower part ofthe furnace, to contract and warp owing to uneven heating of the same. The object of the present.in-. vention is to obviate this disadvanta eby providing an air chamber below the sail? tube plate through which the air passes and keeps the late comparatively cool. The air there by ecomes heated and in order to prevent the loss of the heat thus obtained the air is led from the said chamber to the combustion chamber. In order to render the present s ecifioation easily intelligible reference i he to the accompanying drawing inl which similar letters of reference denote similar parts throughout 1 the several views:

Figure 1 is a -central vertical section through a stove onfiirnacevconstructed according to the present inventio'n'aud Fi 2 is iirpart sectionalplan on-the line A? of,

1.1. .5 %he lower part ofthe furnace at is rovidedfl with a combustioni'chamber b in t 'e-u'sual' manner into which the gas/is conducted throu h the burner tubesc. Thiscorribus: tion cliamber is in connection with the heating tubes 0 by means of the flues d, .The air to be heated passes to theupper chamber-f of the furnace through the inlet pipe 75.,

passes through between the heatingfltubes e. and out of the furnace at '5; Below the tube? plate g and between it 'and'thePcom bustionf chamber an air chamber his provided," The flues d lead throughthis ehal'nberand theair from the outside passesthrough the passages Z or pi as m into the-said chamberdown ried by said tube plate,

throng the central flue n, the-fines ote -the Thus the air will g and will simulta- 7 later combustion. The pipes m are provided with dam era 11 to re unto the amount of airadmittedl 1 :hec'hambe'r It so arates the lower tube plate. from the upper hotsurface of the flues and thus the former will not be distorted by combustion chamber b. cool the lower tube plate neously be pro-heated for abnormal heat while at'the same time no heat is practically lost.

I claim as my mvention:- 1. A furnace comprising an upper and a lower part, a lower tube plate separating said parts, a series of tubes in the upper part carried by said tube plate, said lower part hav- 'ing a combustion chamber therein, and fines connecting said combustion chamber with the series of tubes and said lower part also at its upper part 10- a vin'g an air chamber ower tube cated immediately under the plate and surrounding the fines.

.2. A furnace com rising an upper and a lower part, a lower tu be plate separating said parts, a series of tubes in the upper part carried by said. tube plate, said lower part having acombustio'n chamber therein, and flues connect" said chamber with the series of tubes, all, said lower part also having an air chamber, at its up or art located immediately under the. tu 9' late and surrounding the flues, and means or conducting the air from said air chamber to the combustion chamber. 3'. A furnace comprising an upper and a lower part, a. lower tube plate separating said parts a series of tubes in the upper part carsaid lower part haw mg a combustion chamber therein and lines connecting said combustion chamber with the tubes in the up or part, said lower part having an air chem er 1n its upper part 10- cated immediately under the ower tube plate and a central flue connecting said air chamber with the combustion chamber, and controllable means for feeding air to said air chamber, I

5 .Intestimohy whereof I aflix mysignature m the presence of two witnesses. V HEINRICH GERDES.

" Witnesses:-

Hnimr Hasrnn, WOLDEMAR HALUPT. 

